|
|
October 29th, 2014
UPDATE: On October 29th, at the Nationals, Derek Rodgers beat his own new record, with a 200-12X!
Congratulations to Derek Rodgers for setting a new 1000-yard National Record with a score of 200-11X at the Arizona Long Range Regional in Phoenix. A past national F-Class Champion, Derek is a member of Team Sinclair and the U.S. National F-TR team. Derek’s rifle is built on a Kelbly action, using a Bartlein barrel and a McMillan stock. It is topped with a Nightforce Optics scope. His ammo was made using Berger bullets, Lapua brass and Hodgdon Powder.
F-Class competition continues this week at the Ben Avery Shooting Facility in Phoenix Arizona this week. The 2014 F-Class National Championhip runs October 28 through November 2, 2014. The F-Class National Championship is a multi-day match comprising of all shots at 1000 yards. There will be a mix of individual and four person team matches. The competition consists of two different Divisions: F-Open and F-TR (Target Rifle). Each Division is made up of five different Categories: High Master, Master, Expert, Sharpshooter and Marksman.
October 28th, 2014
 In discussions of ballistics, you’ll see references to “tangent” and “secant” bullet shapes. We know that, for many readers, these terms can be confusing. To add to the confusion, bullet makers don’t always identify their projectiles as secant or tangent designs. This article provides a basic explanation of tangent and secant designs, to help you understand the characteristics of both bullet shapes.
Tangent vs. Secant vs. Hybrid
Most match bullets produced today use a tangent ogive profile, but the modern VLD-style bullets employ a secant profile. To further complicate matters, the latest generation of “Hybrid” projectiles from Berger Bullets feature a blended secant + tangent profile to combine the best qualities of both nose shapes. The secant section provides reduced drag, while the tangent section makes the bullet easier to tune, i.e. less sensitive to bullet seating depth position.
Berger Bullets ballistician Bryan Litz explains tangent and secant bullet ogive designs in a glossary section of his Applied Ballistics website, which we reprint below. Bryan then explains how tangent and secant profiles can be combined in a “hybrid” design.
How Bullet Ogive Curves are Defined
While the term “ogive” is often used to describe the particular point on the bullet where the curve reaches full bullet diameter, in fact the “ogive” properly refers to the entire curve of the bullet from the tip to the full-diameter straight section — the shank. Understanding then, that the ogive is a curve, how is that curve described?
LITZ: The ogive of a bullet is usually characterized by the length of its radius. This radius is often given in calibers instead of inches. For example, an 8 ogive 6mm bullet has an ogive that is a segment of a circular arc with a radius of 8*.243 = 1.952”. A .30-caliber bullet with an 8 ogive will be proportionally the same as the 8 ogive 6mm bullet, but the actual radius will be 2.464” for the .30 caliber bullet.
For a given nose length, if an ogive is perfectly tangent, it will have a very specific radius. Any radius longer than that will cause the ogive to be secant. Secant ogives can range from very mild (short radius) to very aggressive (long radius). The drag of a secant ogive is minimized when its radius is twice as long as a tangent ogive radius. In other words, if a tangent ogive has an 8 caliber radius, then the longest practical secant ogive radius is 16 calibers long for a given nose length.”
Ogive Metrics and Rt/R Ratio
LITZ: There is a number that’s used to quantify how secant an ogive is. The metric is known as the Rt/R ratio and it’s the ratio of the tangent ogive radius to the actual ogive radius for a given bullet. In the above example, the 16 caliber ogive would have an Rt/R ratio of 0.5. The number 0.5 is therefore the lowest practical value for the Rt/R ratio, and represents the minimum drag ogive for a given length. An ogive that’s perfectly tangent will have an Rt/R ratio of 1.0. Most ogives are in between an Rt/R of 1.0 and 0.5. The dimensioned drawings at the end of my Applied Ballistics book provide the bullets ogive radius in calibers, as well as the Rt/R ratio. In short, the Rt/R ratio is simply a measure of how secant an ogive is. 1.0 is not secant at all, 0.5 is as secant as it gets.
 Hybrid Bullet Design — Best of Both Worlds?
Bryan Litz has developed a number of modern “Hybrid” design bullets for Berger. The objective of Bryan’s design work has been to achieve a very low drag design that is also “not finicky”. Normal (non-hybrid) secant designs, such as the Berger 105gr VLD, deliver very impressive BC values, but the bullets can be sensitive to seating depth. Montana’s Tom Mousel has set world records with the Berger 105gr VLD in his 6mm Dasher, but he tells us “seating depth is critical to the best accuracy”. Tom says a mere .003″ seating depth change “makes a difference”. In an effort to produce more forgiving high-BC bullets, Bryan Litz developed the hybrid tangent/secant bullet shape.
Bryan Litz Explains Hybrid Design and Optimal Hybrid Seating Depths
Story sourced by Edlongrange.
October 28th, 2014
This Wednesday, October 29, Shooting USA TV features the Bushnell Brawl, a tactical competition that draws top long-range shooters from the military, law enforcement and the civilian shooting communities. The match is held at the famed Rifles Only range in Kingsville, Texas. The Brawl is a one-of-a-kind physical and mental challenge — 20 events test each shooter’s ability to read wind, figure ballistics, and adapt to difficult shooting scenarios. And, each year, the competition proves to be even more challenging. There is even a helicopter stage.
“Whenever the difficulty ramps up, they step up, and we’ve seen it for the last fifteen years doing matches,” says Rifles Only Director, Jacob Bynum. “Ramp up the difficulty, quality goes up.”
The signature event is Trench Warfare, where each competitor gets a chance to shoot from a helicopter before running to the trench. Competitors also shoot from the tower, where shots are out to 1,000 yards. Not all events are shot over long distance. The Five Dot Drill and Know Your Limit on paper are shot inside 100 yards.
Watch Preview of Bushnell Brawl
Shooting USA Television Wednesday Showtimes:
Eastern Time – 3:30 PM, 9:00 PM, 12:00 M
Central Time – 2:30 PM, 8:00 PM, 11:00 PM
Mountain Time – 1:30 PM, 7:00 PM, 10:00 PM
Pacific Time – 12:30 PM, 6:00 PM, 9:00 PM
October 27th, 2014
Hey guys here’s a torture test video that’s really worth watching — you’ll be shocked and amazed (we guarantee it). In this video, Nightforce Exec Kyle Brown (with help from NF employee Sean Murphy), absolutely brutalizes a Nightforce NXS 5.5-22x56mm scope. He bangs it on a concrete bench-top, throws it 50 yards downrange, knocks it on a hardwood beam multiple times, and then heaves it back again. We kid you not. To our eternal surprise, the Nightforce scope survives all that abuse and shoots fine. What did Timex once say — “Takes a licking and keeps on ticking”?
You’ve got to watch this video — it was shot with five cameras and runs with no “time-outs”, cutaways, or video tricks. What you see is what you get. This is one tough NXS. Thank you Kyle Brown and crew for taking the time to prove the durability of Nightforce Optics products.
Nightforce Torture Test – Uncut – Full Length from Nightforce Optics
If you want to watch this video offline (or share it with your buddies in the future), here are links:
Share Video: http://vimeo.com/109698139
Download Standard Definition Video (640 x 480, 27 megabytes)
Download High Definition Video (1280 x 720, 86 megabytes)
October 27th, 2014
Talented 3-position shooter (and trick-shot artist) Kirsten Joy Weiss says that any day at the range is “always a good day”. Here is her photo to prove it. If that shot doesn’t motivate you to spend a day outdoor with rifles, we’re not sure what will…
“Always a good day…” — Kirsten Joy Weiss
Editor’s Comment: We agree with Kirsten that a day at the range is “always a good day”, except well, er, when you ventilate your chronograph, or leave your bolt at home, or load the wrong ammo, or drop a steel gong on your foot, or have a dead battery in your car, or forget the gate lock combination. If you shoot often enough, there’s a chance that one (or more) of those things might happen. But in actuality, getting out to the range is still worth it — especially if you’re there with good friends. Thanks Kirsten for the reminder.
October 27th, 2014
Today, October 27th, is the birthday of President Theodore (“Teddy”) Roosevelt. An avid explorer, hunter, and firearms enthusiast, Teddy Roosevelt (TR) was a larger-than-life figure who lead this nation as it emerged as a world power.
Theodore Roosevelt — A Great Leader
If you want to learn more about TR, we strongly recommend Theodore Roosevelt on Leadership, a book by noted author and political analyst James Strock. This work captures the vision, commitment, and personal courage that marked Theodore Roosevelt’s career. Theodore Roosevelt was a leader of uncommon strength who, through the sheer force of his extraordinary will, turned America into a modern world power. Thrown headfirst into the presidency by the assassination of his predecessor, he led with courage, character, and vision in the face of overwhelming challenges, whether busting corporate trusts or building the Panama Canal. Roosevelt has been a hero to millions of Americans for over a century.
October 26th, 2014
 Effects Of Cartridge Over All Length (COAL) And Cartridge Base To Ogive (CBTO) – Part 2
by Bryan Litz for Berger Bullets.
Part One of this series focused on the importance of COAL in terms of SAAMI standards, magazine lengths, seating depths, and pressure levels. Another measure of length for loaded ammunition is highly important to precision, namely Cartridge Base to Bullet Ogive Length (CBTO).
Figure 2. Chamber throat geometry showing the bullet jump to the rifling or lands.
Look at Figure 2. Suppose the bullet was seated out of the case to the point where the base of the bullet’s nose (ogive) just contacted the beginning of the riflings (the lands) when the bolt was closed. This bullet seating configuration is referred to as touching the lands, or touching the riflings and is a very important measurement to understand for precision hand-loading. Due to the complex dynamics of internal ballistics which happen in the blink of an eye, the distance a bullet moves out of the case before it engages the riflings is highly critical to precision potential. Therefore, in order to systematically optimize the precision of his handloads, it’s critically important that the precision hand-loader understands how to alter bullet seating depth in relation to the barrel rifling. Part of the required knowledge is understanding how to accurately and repeatably measure the Cartridge Base To Ogive (CBTO) dimension. This is explained in the FULL ARTICLE.
Bryan Litz offers an extended discussion on how to measure CBTO using different tools and methods, including the Hornady OAL gauge. You can read this discussion in the full article found on the Berger Bullets website. CLICK HERE to Read Full Article.
Why Not Use CBTO as a SAAMI Standard?
If CBTO is so important to rifle accuracy, you might ask, “Why is it not listed as the SAAMI spec standard in addition to COAL?” There is one primary reason why it is not listed in the standard. This is the lack of uniformity in bullet nose shapes and measuring devices used to determine CBTO.
Figure 4. Two different bullet shapes, seated to the same CBTO length, but different COAL. Note the shiny scratches on the bullets made by the comparator tool which indicates a point on the bullet ogive near where the ogive will engage the riflings.
Benefits of Having a Uniform CBTO
There is another aspect to knowing your CBTO when checking your COAL as it pertains to performance. With good bullets, tooling, and carefully-prepared cases you can easily achieve a CBTO that varies less than +/- .001″ but your COAL can vary as much as .025″ extreme spread (or more with other brands). This is not necessarily bad and it is much better than the other way around. If you have a CBTO dimension that varies but your COAL dimension is tight (within +/- .002″) then it is most likely that your bullet is bottoming out inside the seater cone on the bullet tip. This is very bad and is to be avoided. It is normal for bullets to have precisely the same nose shape and it is also normal for these same bullets to have nose lengths that can vary as much as .025″.
|
Summary of Cartridge Base To Ogive (CBTO) Discussion
Here are four important considerations regarding bullet seating depth as it relates to CBTO:
1. CBTO is a critical measurement to understand for handloaders because it’s directly related to precision potential, and you control it by simply setting bullet seating depth.
2. Tools and methods for measuring CBTO vary. Most of the measurement techniques have pitfalls (which may give rise to inconsistent results) that you should understand before starting out.
3. A CBTO that produces the best precision in your rifle may not produce the best precision in someone else’s rifle. Even if you have the same rifle, same bullets, same model of comparator gauges, etc. It’s possible that the gauges are not actually the same, and measurements from one don’t translate to the same dimension for another.
4. Once you find the CBTO that produces the best precision in your rifle, it’s important to allow minimal variation in that dimension when producing quality handloads. This is achieved by using quality bullets, tooling, and properly preparing case mouths and necks for consistent seating.
CLICK HERE to Read Full Article with More Info |
Article sourced by EdLongrange. We welcome tips from readers.
October 26th, 2014
Here’s a feel-good story, particularly for those of us getting up in years. Walt Berger recently proved you are as young as you feel — and you can enjoy shooting success at any age. Walt Berger, well into his 80s, won a big benchrest victory last month, taking the Sporter Class 100-yard Aggregate at the 2014 NBRSA Score Nationals. In so doing, Walt earned his 20th Hall of Fame Point. That’s a great accomplishment for the Elder Statesman of Benchrest. Congrats to Walt! And, yes, of course, Walt was shooting a projectile made by Berger Bullets — the 6mm 65gr BT Target bullet.
About Walt Berger
Walt Berger started making rifle bullets in 1955 because he believed he could make better bullets than those that were available at the time. He regularly participated in benchrest shooting competitions (and still does today), which requires the highest levels of precision in all components. In 1987, Walt grew his bullet making operation beyond a part time hobby after encouragement from his second wife Eunice (Walt lost his first wife Mary to cancer). Together, they grew the business into a large-scale precision rifle bullet-making operation.
Walt was born at the end of the Golden Twenties and the beginning of the Great Depression. His story is about overcoming great odds and seeing things through to success when almost everyone around him was convinced he would fail.
Walt Berger with two younger generation Berger Bullets employees at the 2014 NRA Annual Meeting.
October 26th, 2014
Brownells is offering more than month of deals on AR-15 hardware. Brownells’s “Back In Black Rifle Event” features six weeks of special, discount pricing on AR-15 upper receiver parts kits and accessories. The event culminates with blowout specials on the official Black Rifle Friday Weekend (from Friday, November 28 through Cyber Monday, December 1st).
Each Monday, leading up to Black Rifle Friday, Brownells will unveil a new package that includes all the required parts (except for lower receiver) to build a different version of the AR-15. Every package will give customers significant savings compared to buying all the parts separately(and eliminate the chance of overlooking important items).
Customers can see a new AR-15 package every Monday, from now until November 24, by visiting the Black Rifle Event Page at Brownells.com.
In addition to the main sale on AR-15 components and tools, some weeks will feature specials on 1911 magazines and parts, as well as accessories for Remington 870 shotguns.
October 25th, 2014
“Rumble on the Range”, the 3-Gun Nation (3GN) Championship, takes place today, October 25th at the U.S. Shooting Academy in Tulsa, Oklahoma. The 2014 FNH USA 3-Gun Nation Pro Series culminates in this season-ending event. This is a big money match, with serious prize money going to the winners. Top 3GN Pro Series competitors will duel in a head-to-head, no holds barred shoot-off for cash, prizes and the championship title.
 There are 40 competitors — 32 men and 8 women — with separate classes for the guys and the gals. In the men’s championship, the top 32 male finalists will compete for a $50,000 cash payday sponsored by Leupold and NRA Sports. Shooters will use pistols, AR-platform rifles, and shotguns — all tricked out for maximum speed and high capacity.
The 3-Gun Nation Ladies Professional Series, sponsored by Samson Manufacturing, concludes with the top eight (8) ladies competing for $25,000 Cash. The shooters to beat are 2013 Mens’ Champion SSG Daniel Horner of the USAMU and 2013 Ladies’ Champion Lena Miculek (at right).
Watch Video from 2013 3-Gun Nation Championship
HOW IT WORKS:
The event will feature 3 stages of fire (shoot-off stages). Each of the top 32 (males) and 8 (females) will be paired against each other based on series rank. The first of the paired competitors to complete the course of fire will advance. Stage 1 will feature 32 males; 8 females. Stage 2 will feature 16 males; 4 females. Stage 3 will feature the final 8 males; final 2 females. The final male will win the $50,000 cash prize. The final female will win the $25,000 cash prize.
|
Where:
U.S. Shooting Academy
6500 East 66th St N
Tulsa, OK 74117
(918) 948-7856 |
When:
Saturday, October 25
All Day 8:00 AM-6:00 PM
Grand Finale: 4:00-6:00 PM |
USShootingAcademy.com
MAP HERE |
3-Gun Nation Side Stage
A special Side Stage will be open to the public with guns and ammo provided. Spectators can try their hands at 3-Gun, shooting pistols, AR-type carbines, and shotguns. The top score wins a DPMS AP4 Carbine!
Machine Gun Shoot
A machine gun demo featuring a wide variety of full-auto firearms with be open to the public, under the direction of the U.S. Shooting Academy Range staff. Ammo fees apply.
Sneaky Ladies. Maggie Reese (left) and Janna Reeves (right) try to steal the big $25,000 check!
|
